本文对广东和平蒙脱石及其热处理产物进行了化学分析、差热和热重分析、 X 射线粉末衍射分析、红外吸收光谱分析、原子力显微镜及魔角旋转核磁共振等研究结果表明, 蒙脱石在热处理温度为500 ~700℃ 时, 其 Si、 Al 的 M A S N M R 谱表现为变蒙脱石的谱学特征加热到659℃ 时,蒙脱石八面体片中的羟基开始脱失, 但层状结构仍然保持, 这种羟基的脱失过程对应着八面体片中 Al ( Ⅵ) 向 Al ( Ⅳ) 的转变温度达到900℃ 时, 与蒙脱石有关的 Si 谱消失, 标志着其层状结构完全被破坏, 并有新的矿物相χ-SiO2 产生1000℃ 时, 出现较多的χ= Si O2 , 同时热产物的 Al 谱发生较大的变化当温度为1200℃ 时, 则出现方英石及莫来石相当热处理温度达到1350℃ 时,方英石及莫来石的含量略有减少, 并出现较多的堇青石相.
The montmorillonite in Heping, Guangdong province was studied by chemical analysis, DTA, TG, XRD, IR, AFM and MAS NMR. It is
found that when the temperature is between 500~700℃, The Si and Al spectra of montmorillonite display the spectrum characteristic
of meta-montmorillonite. When the thermal treatment temperature reaches 659℃, the hydroxyl in octahedra sheet begins dehydrating, but the
layer structure is maintaining, this process is corresponding to Al(Ⅵ) turning to Al(Ⅳ) in octahedra sheet. When the temperature reaches 900℃, the Si spectra relevant to montmorillonite disappear, that
means the layer structure of montmorillonite is destroyed, and the new mineral phase χ-SiO2 is found. When the temperature reaches 1000℃,
there is more χ-SiO2 phase produced by phase change, meanwhile the Al spectra of thermal products change greatly. When the temperature reaches
1200℃, cristobalite and mullite phases appear. When the temperature reaches 1350℃, the cristobalite and mullite phases reduce a few, and more
cordierite phases appear.
参考文献
[1] | 章庆和. 矿物学报,1989, 9 (2): 177--180 2 袁望治,黎文辉,陶大权. 矿物学报,1990, 10 (3): 248--254 3 陈丰,林传易,张惠芬等. 矿物物理学概论. 北京: 科学出版社,1995. 231--244 4 Alma N C M, Hays G R, Samoson A V, et al. Analytical chemistry, 1984, 56 (4): 729--733 5 王辅亚,张惠芬,吴大清等. 中国陶瓷, 1993, (2): 1--6 6 吴平霄,张惠芬,郭九皋. 地球科学进展, 1998, 13 (4): 351--355 7 Drake B, Prater C B, Weisenhorn A L, et al. Science, 1989, 243: 1586--1588 8 Binnig G, Quate C F, Gerber Ch. Phys Rev Lett, 1986, 56: 930--933 |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%